PULSEWIDTH MODULATION SIGNAL GENERATOR AND SWITCHING MODE POWER SUPPLY USING PULSEWIDTH MODULATION SIGNAL GENERATOR

摘要

This invention relates to a switched-mode power supply, and a power supply unit, output unit, a feedback circuit, a power supply and a switching control unit.; The invention is to be applied to the switch control unit to the power unit through a single chip, and the junction type field effect transistor and to install inside the switch, and the output current of the system during the initial drive power supply the field effect transistor and an internal switch in the switching control section and, when the power supply voltage of the threshold value is formed from the power supply section to the output current of the power supply unit to control the internal switch from being applied to the power source, reducing the waste of electric power, increase the performance and reliability of the products, the effect of reducing the manufacturing cost so that occurs.